Bending device for pipes and bars



June 3, 1930. F. B. POTTER .BENDING DEVICE FQR PIPES AND BARS li-iled June 6. 1928 Patented June` 3,Y 19,30

y' EBLED E. POTTER, OE Los ANGELES, CALIFORNIA EENDING DEVICE EOE rirEs AND BARS y. Application' led June` 6,

Thisinvention relates to bending devices for pipes andbars, and-has for an objectthe provision of an improved bending device by means of which pipes may be. bentwithout danger of collapsing. K v. Y p

' Another objectisthe provision off'a device for bending pipes and bars, which 1s so ar- ,ranged as to permit 'the readyinsertion of the article to'be bentinto thebending appa. 10 ratus, and which may-'be operated with a Inin-r imum of labor and expenditure of time.

'A further object` is thevr provision of a'bendl jing'apparatus of the` general character dej scribed, Which is providedwith a pluralityofi v;'interchangeable anvils or forms about which 'the article may be bent so'that bends of dif'- ferentfradii maybe formed in the article.

It is af further *Obj ect of' this' invention to f produce a'bending device provided with an 20.' improved'type of clamping means whereby the article 1to be bent may be securely clamped closely adjacent an endvthereof'to permit bending the article Vata pointy very close to that Y end.

.25. 4 The invention possessesotherobjects 'and features jof advantage, some of which, with the foregoing, will beset forth in the follovving description of the preferredform ofthe inventionA which `is illustrated in the draw- A3,0 ings' accompanying and forming part of the specification-.- Itis to'belunderstood that Ido not Alimit myselffto theshowing made by the said 'drawingsand description, 'as I may adopt variations Vofthepreferred form Within the soope1of1ny invention-'as set forth in the claimsypf'fm Y, c Y

.Referring itothe drawings line242of 1', `with theydirection of view indicated by 'the' arrows. g

" tion'i of fcviewuindicatedby thearrows. l

4 is a view similarto Fig. Y1', but, shovv-l ing the `device as: beingiactuated to bend a pieceof'pi'pej i .1923. seijiai No. 283,324.

size, mounted upon the device to form a bend in the pipe, having a smaller radius.

The device of the present invention yis of general application, bein adapted to bend all manner of rods and tu es, irrespective of size or material, Within certain limits; but the device finds aparticular field of utility for electricians74 use, since it peculiarly adapted forbendin conduit to the shapes frequently required by electricians infinstal- 60,1 ling conduit preparatory toinserting elec` tric Wiring therein.' In terms of broad inclusion therefore, the devicefcomprises a body mounted for pivotal movement upon any `suitable stationary structure, this body be- 651:

ing providedwithclamping means for securely clamping one portion of the 'member to` be bent. The body is also provided with an arcuate anvil or bending formabout which `the article' may bel bent by'svvinging the body 701 about its pivotal mounting, there'being a stationary member adapted to engage the article at a point spaced from the arcuate member so that as the body is rotated, the articleis W'rlapped around the arcuate surface k,of the v751 anV1 Y y .h

' Specifically describing the vpreseffit "lbgd ment, I have provided a'body 6 Whichis'connectedb'y meansof a pivot pin'7, toa station` aryv arm v8,'for pivotal'movement 'about the 80' pin 7 inrespectto the'stationary arm. `The stationary arm 8 is adapted to be securednto any lsuitable structure such as aV column 9, bybolts 11, lag' sc revvs Orother suitable fastening means.V An anvil is provided in the 85 form of an'end meinber12; andforfthe purv A y pose of adapting the bending" device to form lii-greYV 1 isa sideelevation of the devicek constructed in accordance With` the invention 10VV Fig. l2 is vasectional view taken upon the bends'ofdiiferent radii, the end members 12 arev preferably removable and interchange! able; Fig'. 'shovving an end member'13 of 90* smaller radius than that shown inFgs. land 4'. fEach' of the end members 12 and 13 is pro- -Figil 3 is a` horizontal sectional view* taken vided With if an arcuate surface l 145` which, when the' associated end member 1s secured 1n yoperative position upon the body 6, is difsposedabOut-the pivot pin 7. Preferably, when so positioned, the pivot pin 7 is arranged eccentrically in respectA to thev arcuate surfac'e`x14, being'V proximal to the upper side V16 ofthearcuate surface 14. As a result ofy iw this arrangement, when the body Gis' inthe positionindicatedupon Fig. 1,Y the'upperit easierto insertapipe 17er the like into Vthe clamping means w'hen the body 6 is ele vated. Y Y s j The end members 12 and 13`are removably securable -to the body: 6V inanyconvenient imanner such as by a dove-tailed` projection 18y upon the body @adapted to seat within com- I Y p'lementarily shaped notches 19..,inrthe end` ative position. A groove 21 is formed in the v,

members 12 and 13 to retain them inoperarcuate surface 14-of each of theend members1121and 13, thisgroove being rounded and of substantially-the same radius as the pipe 17 or any otherar'ticle to be bent.

Y-Ql-hepipe 17 ory thelike, which is to ybe f bent, is clamped againstthe base vorbody 6., 'atsoneend ofthe grooved end;member12,v v so lthatnxthe proj ectingiend ofthe pipe may be" bent .around the arcuate surface 1 4 and into .the groove-121ithereinprovided. The meansl for clamping the pipe extends tangentially from theproximalend of thefarcuatesurface .14., and preferably includes; as lower jaw 225- rigid` with .the base 63 yand upper` adjustable jaw 23; mounted upon a threaded ysbanl f `24 received'jthrougha lthreaded bearing-26,1.

formedv uponzthe ,upper-'end of an extension 27- preferably. integral with 'the base' 6.; An

4operating ihandle 28y 'isV provided upon the, shank 24l v for -thezrotation thereof, to" adjust Y the position of thejawf23-in.respectto the pair offplat'es .3lof resilient metal,. ea Ch-se.,: 'l cured-at one endltotheaw 23 asbyscrews: 32,V and; with the 'otherend.y `33A f of 'eachv dis.- Y posedwithin a groove 34 formed'in the lower j y l n jawv22j The shankf24 isswiveled tothe adf justable jaw 23; and inorder togpermit a j certain degree of v lrocking movement of thef`v` adjustable jawin respect to the shankf24, the.r

swiveled connectionv 'comprises preferably a The opposed-facesofthe v23,y

Qpart *rotary movement to thejbasevvdin re' .f spectto the stationary arm 8l [about the pivot 'Y pin 7..` 1 Means for wrapping the pipe 17zabout; the arcuate surface14iasl the lbase ,v6 isso; rovv tated, is provided, preferably in theV form 'of-f j j .recents/tat mechalCal advantage. may be'ganed .tolmV-v groove 46 fof which is in alignmentwith the i jaws22 and/23 and the groove 21'in kthe arcuate` surface 14..V

, Since end members "12, 13-,fof1diierent f' sizes,` are to"beiemployedpaI-have `found l i ydesirable to also employrollers44of differ 'ent sizes.- Ac/ ordingly, a larger grooved `roller'447v isfshown` upon Fig. v5, it being iiitended to employ. this larger rollery 47 in `conjunctionwiththefsmaller end member 13.. Q Its'hould be understood however, lthat it will 4be fully as elective'to employ a single roller 44,;but'?tozprovideaadditionaLsockets for the reception ofthepin ,43 at various pointsialongl. i the armi8: sothattheroller 44vcould bepo-l Y sitioned'fwlierever desiredpin Yrespect to. the." l

v lend member 12 or 13 beingemployed. v X3i,

W'fhenit. is desired :to: ben'da*Y piecejof pipe y Y j 1-7-forA anysimilarfarticlay.thegarticle isA clampednwithinthe groovesr and 37 of the the adjus'table' -rjaweV 23 ,f'tliereupon Y This should A.be'done,,witlithe base in'the',-positionfi f i i kildeated:fuporrFig. 1,'.Zwith-the pipe V17 eX- `I 1 tending;- from',thefjawsfunder thevrollerj i Y 'Ehenby-exertingfforcedownwards jupon thel v "f l95` piyjotfpn? ,but sincecorr'esponding :upward i v, movement ofthe body of the pipeV 17;.'is pre# f .i'feiltecl;Ibyj k.engagemen;itherewithwith the.

handle 42,-thefV base 6 is'2 pivotedlaboutgihe roller-A4, thefpipe 17,7will be wrappedabout the arcuatersurface 14; to produce a bend marine-,1719i radius correspondngjto;that ojthejendgmemberi-12 or 13, dependingupon f V V f 'Y whichgendmemberY is'v beingk employed-.53115 is ff to be understood ofcourse, that bends Vof any 1- desired-eXtent-1-mev-.be nl?oduced, .depending 'uren thel dst iS- rotated/f ,in

j f n' istat .with ySaid rigid jaw f cuate surface stationary pi lig 10a ance through iwhich s thebase 61 Y so Y t secured at one end of each to said adjustable comprising ajaw rigid kwith the base and extending tangentially from one end of said arcuate surface, an extension on said base, a shankthreaded through said extension, an adjustable'jaw having a recess in the outer facejthereof for the receptiony of the end of said shank, and resilient plates'secured at one end of each to` said adjustable jaw with the other end Vof each disposed within a groove in said shankY to resiliently retain the end Y of the shank within the recess, a stationary pin spaced from said arcuate surface, and a rollerjcarried by saidstationary pin in align- Yment with said jaws. l

3. A clampingfdevice comprisinga base, a

jaw rigid therewith, an extension on said base, a shank threaded through said extension, an adjustable jaw having a recess in the outer face thereof, for the reception of the end of said shank, and resilientplates secured at one end of each to said adjustable jaw with the other end engaging behind a shoulder on said shank to resiliently retain the end of the shank within said recess.

Y 4. A clampingdevice comprising a base, a jaw rigid therewith, an extension on said base, a shank threaded through said eXtension, an adjustable jaw having a recess in y the outer'face thereof for the reception of the end'of said shank, and resilient plates jaw with the other. end'engaging behind a shoulder on said shank to resiliently retain 'the end of the shank VWithin said recess, said jaws ha'v'ingfopposed grooves eXtending longitudinally thereof, and internal threads formed in said jaws at one end of said grooves. In testimonyv whereof I have signed my name to this` s'pecication.V

FRED B. POTTER.

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